Abstract
Abstract 2-(2′-Hydroxyphenyl)quinoxaline ( I ) in the IR spectrum shows an absorption band at 1665 cm −1 which corresponds to the CO of the quinonoid form, thereby indicating that the hydrogen atom of the OH group is appreciably acidic. This study was undertaken to confirm the acidic nature of the hydrogen atom of the OH group and to augment our earlier efforts in search of new luminescent dyes for solar collectors. The UV and fluorescence characteristics of 2-(2′-methoxyphenyl)quinoxaline ( II ) and 2-phenylquinoxaline ( III ) were also studied. The p K a values of the various equilibria were determined in the ground state spectrophotometrically and the excited state p K a values were estimated by applying the Forster equation. It is observed that the hydroxyl group is more acidic and the ring nitrogen atom more basic ( I , II , III ) in the first excited singlet than in the ground state. The pH dependence of the absorption and fluorescence spectra of I , II , and III was investigated. It was observed that phototautomerism exists in I .
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